It is abnormal for purebred Bichons to have black spots on their bodies. Generally speaking, purebred Bichons mostly have white hair and rarely have other mottled colors. If black patches appear on the skin of a Bichon Frize, it is likely to be caused by pigmentation caused by endocrine diseases, melanoma, flea bites, fungal skin diseases, etc. If a diagnosis is needed, it is best to go to the pet store in time. Hospital examination and relevant treatment. Of course, it may also be that the dog's own pigment distribution is abnormal.